<template>
    <div class="list" ref="wrapper">
      <div>
        <div class="area">
          <div class="title border-topbottom">
            当前城市
          </div>
          <div class="button-list">
            <div class="button-wrapper">            
             <div class="button">{{this.doubleCity}}</div>
            </div>
          </div>
        </div>
        <div class="area">
          <div class="title border-topbottom">
            热门城市
          </div>
          <div class="button-list">
            <div class="button-wrapper" 
                 v-for="item of hotCities" 
                 :key="item.id"
                 @click="handleCityClick(item.name)">            
             <div class="button">{{item.name}}</div>
            </div>            
          </div>
        </div>
        <div class="area" v-for="(item, key) of cities" :key="key" :ref="key">
          <div class="title border-topbottom" >{{key}}</div>
          <div class="item-list">
            <div class="item border-bottom" 
                 v-for="city of item" 
                 :key="city.id"
                 @click="handleCityClick(city.name)">{{city.name}}</div>
          </div>
        </div>        
      </div>      
    </div>
</template>

<script>
import BScroll from 'better-scroll'
import { mapState, mapMutations, mapGetters } from 'vuex'
export default {
  name: 'CityList',
  props: {
    cities: Object,
    hotCities: Array,
    letter: String,
    // changeValue: null
  },
  methods: {
    handleCityClick (city) {
      // this.$store.dispatch('changeCity', city)
      // this.$store.commit('changeCity', city) //组件可以直接调用mutations，省略actions
      this.changeCity(city) 
      this.$router.push('/')
    },
    ...mapMutations(['changeCity'])
  },
  computed: {
    ...mapState({
      currentCity: 'city' 
    }), //把公用组件的city映射到我的计算属性里，映射的对象是currentCity
    ...mapGetters(['doubleCity']) //getters的直接映射过来
  },
  mounted () {
    this.scroll = new BScroll(this.$refs.wrapper) //获取dom
    // setTimeout(() => {
    //   this.changeValue = 1;
    //   this.$nextTick(() => {
    //     this.calculate
    //   })
    // });
  },
  watch: {
    letter () {
      if (this.letter) {
        const element = this.$refs[this.letter][0]
        this.scroll.scrollToElement(element)
      }
    }
  }
}
</script>

<style lang="stylus" scoped>
  @import '~styles/variables.styl'
  .border-topbottom
    &:before
      border-color : #ccc
    &:after
      border-color : #ccc
  .border-bottom
    &:before
      border-color : #ccc
  .list
    overflow : hidden
    position: absolute
    top: 1.58rem
    left: 0
    right: 0
    bottom: 0
    .title 
      height : .54rem
      line-height : .44rem
      background : #eee
      font-size : .26rem
      padding : .05rem .05rem
      color : #666
    .button-list
      padding : .1rem .6rem .1rem .1rem
      overflow : hidden
      .button-wrapper
        float : left
        width : 33.33%
        .button
          height : .4rem
          line-height : .4rem
          margin: .1rem
          text-align : center
          border .02rem solid #ccc
          border-radius : .06rem
          color : #212121
    .item-list  
      .item
        line-height : .76rem
        color : #212121
        padding-left : .2rem
      
</style>